Triquetral fracture - pooping duck sign

Case contributed by Dr Matt Skalski

Presentation

Wrist pain post trauma.

Patient Data

Age: 25 years
Gender: Male

A fragment of bone is present along the dorsal aspect of the proximal carpal row, adjacent to the dorsal cortex of the triquetrum

The scaphoid is outlined in yellow, the lunate in blue, and the visualized dorsal portion of the triquetrum in green. These structures combine to resemble a duck, with the avulsed triquetral fragment resembling poop from the duck, as indicated. 

Triquetral fracture is common by virtue of the fact that the dorsal stabilizing ligaments of the wrist share a common attachment site at the dorsal cortex of the triquetrum. 

Case Discussion

I don't recall where I learned the pooping duck sign, but here it is in all its glory. Enjoy. 

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